Reaction mass of sodium(E)-6,7'-carbonylbis(azanediyl)bis(4-hydroxy-3-((E)-phenyldiazenyl) naphthalene-2-sulfonate) and disodium 3-[(4-acetamidophenyl)azo]-4-hydroxy-7-[[[[5-hydroxy-6-(phenylazo)-7-sulphonato-2-naphthyl]amino]carbonyl]amino]naphthalene-2-sulphonate and disodium 7,7'-(carbonyldiimino)bis[4-hydroxy-3-(phenylazo)naphthalene-2-sulphonate]

Endpoint summary

Additional information

Studies on short-term toxicity to fish, aquatic invertebrate and aquatic plants in freshwater showed no toxicity of Direct Red 23 (DR23) to aquatic organisms at the tested limit concentrations; also the test in microorganisms confirms that DR23 is not toxic (i.e. no toxicity observed at the limit concentration).

 

In all cases considered, no L(E)C50 was determined below limit concentrations, because no mortality, nor signs of toxicity, were noted at the limit concentrations tested; thus the higher than (>) L(E)C50 values determined were set as the L(E)C50 for PNEC derivation.

 

Long-term toxicity was not tested because direct and indirect exposure is unlikely due to the risk management measures that will be applied at industrial level. The risk management measures to avoid any release of the substance directly in the environment are discussed in detail within the exposure scenario; furthermore DR23 has a low potential for bioaccumulation and aquatic toxicity is unlikely to occur as indicated by the short-term aquatic testing results.

 

Therefore, long-term toxicity testing is not necessary, because the chemical safety assessment according to Annex I does not indicate the need to investigate further the effects on aquatic organisms.